CN104087709B - A kind of method of melting and reducing height chromium slag in induction furnace - Google Patents
A kind of method of melting and reducing height chromium slag in induction furnace Download PDFInfo
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- CN104087709B CN104087709B CN201410344361.8A CN201410344361A CN104087709B CN 104087709 B CN104087709 B CN 104087709B CN 201410344361 A CN201410344361 A CN 201410344361A CN 104087709 B CN104087709 B CN 104087709B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The present invention relates to a kind of method of melting and reducing height chromium slag in induction furnace, it is characterised in that described method is to be mixed with melting and reducing agent by high chromium slag, add in the molten iron of induction furnace, it is blown into noble gas, the chromium in high chromium slag is reduced to crome metal, it is thus achieved that chrome-bearing steel liquid.The method of chromium in melting and reducing height chromium slag in induction furnace that the present invention provides, it is possible to while high chromium slag of dissolving, utilize noble metal chromium therein to carry out alloying, and easy to operate, the process environmental protection of high chromium slag, good in economic efficiency.
Description
Technical field
The invention belongs to chromic wastes disposal field, relate to a kind of method of melting and reducing height chromium slag in induction furnace.
Background technology
High chromium slag results from converter extracting vanadium-vanadium factory, is a kind of microgranular fine powder, and it results from vanadium extracting process, its
In the element such as the valuable chromium that contains also because having toxicity containing water soluble hexavalent chromium, environmentally harmful element,
Difficult treatment.
The main component of described high chromium slag is as shown in table 1.
Table 1 high chromium slag ingredient table (wt%)
| Composition | Cr2O3 | MnO | P | V2O5 | SiO2 | TFe | K2O | Na2O |
| Content | 40～60 | 0.1～2.0 | 0.020～0.10 | 5.0～1.20 | 8～14 | 3～5 | 0.12～0.20 | 3.0～4.0 |
The processing method of chromium slag is had chromic slag harmlessness to fill after processing by prior art, chromic leaching in chromium slag
Chromium, the blast furnace Non-toxic go out, dissolved in chromium slag process chromium slag etc..But landfill needs after chromic slag harmlessness processes
Chromium slag will be carried out harmless treatment, processing method has dry reduction, wet reducing etc., and it operates complexity,
Batch is had any problem；In chromium slag, the residue of chromic leaching need nonetheless remain for landfill；Dissolve the chromium in chromium slag,
It is comprehensively utilized, brickmaking, do calcium magnesium phosphate, cast stone, making cement mineralizer, chromium slag substitute white clouds
Stone does sintering cast iron, with cyclone furnace attached burning chromium residue detoxifying, for glass colorant etc..And at blast furnace Non-toxic
Reason chromium slag is to process high chromium slag by metallurgy sintered and blast furnace Non-toxic, it is simply that high chromium slag is added State of Blast Furnace
Agglomeration in material, adds in blast furnace part chromium slag of dissolving afterwards, and (Fig. 1 is high to its concrete technology as shown in Figure 1
Stove Non-toxic processes the process chart of chromium slag).
But, these chromic wastes disposal technology all have some limitations, and some removing toxic substances are not thorough, have two
Secondary pollution；Some chromium slag consumptions are few, dispose the cycle long, and progress is slow.Current domestic commonly used outdoor heap
Putting and landfill disposal, chromium slag is directly entered metallurgy sintered mixing material and is sintered removing toxic substances by indivedual factories.
CN102864311 discloses the recovery method in steel-making-LF operation of chromium in a kind of high chromium slag, it include with
Under several steps: (1) is by dry high chromium slag and carbon dust composition mixture, the highest chromium slag and the ratio of carbon dust
Example is between 10:1 to 20:1；(2) during being tapped in ladle arrival LF station in pneumatic steelmaking, by dry
Mixture adds in ladle；(3) molten steel in ladle is blown into stirring of inert gas and heats, at height at LF
In temperature reducing atmosphere, the Cr VI in weight chromium slag is reduced into crome metal in molten steel.LF stove weight chromium slag melts
Melt reducing process chrome-bearing steel directly carries out steelmaking alloy to refer in smelting process, by dry heavy chromium slag and
The mixture of reducing agent is directly added in deoxidation and partially-alloyed steel ladle, utilize in LF its high temperature,
Stirring condition and reducing atmosphere, make the chromium element in weight chromium slag be reduced out, to reach chromium mischmetal
The purpose changed.Although but this technology to the treatment effect of high chromium slag it is also possible that but due to the yield of high chromium slag
Relative to STEELMAKING PRODUCTION chrome-bearing steel very little, it is unfavorable for producing and steadily carries out.
Therefore, this area needs one can utilize noble metal chromium therein while high chromium slag of dissolving
Method, the method has easy to operate, the process environmental protection of high chromium slag, and good in economic efficiency feature.
Summary of the invention
For the deficiencies in the prior art, an object of the present invention is that providing a kind of melts also in induction furnace
The method of former high chromium slag, described method can utilize noble metal chromium therein to enter while high chromium slag of dissolving
Row alloy, has easy to operate, processes environmental protection, and good in economic efficiency advantage.
Specifically, the present invention is achieved through the following technical solutions:
A kind of method of melting and reducing height chromium slag in induction furnace, described method is by high chromium slag and melting and reducing
Agent mixes, and adds in induction furnace molten iron, is then blown into noble gas, the chromium in high chromium slag is reduced to metal
Chromium, it is thus achieved that chrome-bearing steel liquid.
Process chart such as Fig. 2 (Fig. 2 of the method for melting and reducing height chromium slag in induction furnace that the present invention provides
For the process chart of melting and reducing height chromium slag in induction furnace) shown in.
High chromium slag of the present invention is to Cr VI slag.
Chromium is one of most important alloying element in STEELMAKING PRODUCTION, generally adds people's molten steel with the form of ferrochrome
In, with the satisfied different requirements smelting steel grades.The present invention utilizes reducing agent and the height such as carbon in steel [C]
The C dissolved in chromium slag(S)Deng deoxidant element to the Cr in chromium slag2O3Reducing, the Cr restored is as having
Benefit element enters molten steel, it is thus achieved that aluminium alloy, and dominant response is:
(Cr2O3)+3C(S)=2Cr+3CO △ G0=787740-558.97T J mol-1
(Cr2O3)+3 [C]=2Cr+3CO △ G0=719970-462.19T J mol-1
More than reaction is heat absorption reflection, and the constantly heating of induction furnace and reducing atmosphere are conducive to continuing of reflection
Carry out.
Melting and reducing agent of the present invention is selected from any a kind or at least 2 kinds in carbon dust, ferrosilicon powder or aluminium powder
Combination, preferably carbon dust.The combination of described melting and reducing agent is typical but non-limiting includes carbon dust and aluminium powder
Combination, ferrosilicon powder and the combination of aluminium powder, the combination etc. of carbon dust, ferrosilicon powder and aluminium powder.
On ferrochrome produces, lt molten iron adds the ferrochrome of 1kg75%, can restore about 1.86kg chromium；Make with carbon
Reducing agent, lt molten iron adds 1kg carbon, can restore about 2.89kg chromium；1t molten iron adds 1kg aluminum and can reduce
Go out about 1.93kg chromium.It can thus be seen that the reducing power of carbon is relatively strong, and low price, it is easy to obtain in a large number
Take；It addition, along with temperature raises, the reducing power of carbon strengthens substantially, from thermodynamic analysis, uses carbon
Make reducing agent can be reduced by chrome ore, possess the condition of DIRECT ALLOYING, therefore, from reducing power and economy
Angle is weighed, and using carbon is most suitable as the melting and reducing agent of high chromium slag.The present invention preferred carbon conduct
Preferably melting and reducing agent.
Preferably, the mass ratio that described high chromium slag mixes with melting and reducing agent is 9:(0～1).Wherein, described
The mass ratio that high chromium slag mixes with melting and reducing agent does not comprise the point value of 9:0.
Preferably, described high chromium slag is 1:(5～9 with the mass ratio of the molten iron of addition), such as 1:6,1:7,1:8
Deng.
Preferably, the intake of described noble gas is 2.5～5 cubes of ms/h of ton steel；
Preferably, described noble gas is selected from helium and/or argon, preferably argon.
Preferably, the temperature of described reduction is higher than more than 1600 DEG C.
Preferably, in described high chromium slag, with Cr2O3Meter, the content of chromium is 40～60w%.
In the present invention, it is thus achieved that after chrome-bearing steel liquid, in order to reach subject alloy, alternatively, to chrome-bearing steel
Liquid adds alloying metal element, it is achieved alloying.
For example, it is possible to according in chromium content and target ferrochrome, chromium, the difference of content of ferrum add part
Ferrochrome；Or according in Chromador, chromium, manganese, the content of steel, add in aluminium alloy corresponding chromium, manganese,
The elements such as ferrum.Described alloying metal element refers to be formed the metallic element of alloy.
Preferably, one or more the group any during described alloy includes ferrochrome, ferromanganese, ferro-aluminum, molybdenum-iron
Close.
As optimal technical scheme, of the present invention in induction furnace the method for melting and reducing height chromium slag include as
Lower step:
(1) high chromium slag is mixed according to mass ratio 9:1 with carbon dust；
(2) high chromium slag amount 5～the molten iron of 9 times are added；
(3) it is blown into noble gas, the chromium in high chromium slag is reduced to crome metal, it is thus achieved that chrome-bearing steel liquid；
Alternatively, carry out after step (3):
(4) in chrome-bearing steel liquid, alloying metal element is added, it is achieved to molten steel alloying.
Wherein, the amount of the described alloying metal element added in chrome-bearing steel liquid of step (4) is according to target component
Amount be added, such as need to prepare ferro-molybdenum, then need in chrome-bearing steel liquid, add target-molybdenum-iron and close
The component requirements of gold, adds corresponding metallic element.
Compared with prior art, there is advantages that
The method of melting and reducing height chromium slag in induction furnace that the present invention provides, it is possible to the same of high chromium slag of dissolving
Time, utilize noble metal chromium therein, the least and easy to operate, the process environmental protection of high chromium slag, warp
Help profitable.
Accompanying drawing explanation
Fig. 1 is the process chart that in prior art, blast furnace Non-toxic processes chromium slag；
Fig. 2 is the process chart of melting and reducing height chromium slag in induction furnace.
Detailed description of the invention
For ease of understanding the present invention, it is as follows that the present invention enumerates embodiment.Those skilled in the art it will be clearly understood that
The only help of described embodiment understands the present invention, is not construed as the concrete restriction to the present invention.
Embodiment 1
A kind of method of melting and reducing height chromium slag in induction furnace, described method comprises the steps:
(1) high chromium slag is mixed according to mass ratio 9:0.5 with carbon dust；In described high chromium slag, with Cr2O3Meter,
The content of chromium is 40～60w%
(2) molten iron of high chromium slag amount 8 times is added；
(3) at a temperature of 1600 DEG C, it is blown into the noble gas of 3.5 cubes of ms/h of ton steel, by high chromium slag
In chromium be reduced to crome metal, it is thus achieved that chrome-bearing steel liquid；
Alternatively, carry out after step (3):
(4) according to the target component of molten steel, in chrome-bearing steel liquid, alloying element is added, it is achieved alloying.
Embodiment 2
A kind of method of melting and reducing height chromium slag in induction furnace, described method comprises the steps:
(1) high chromium slag is mixed according to mass ratio 9:0.1 with carbon dust；In described high chromium slag, with Cr2O3Meter,
The content of chromium is 40～60w%
(2) molten iron of high chromium slag amount 9 times is added；
(3) at 1700 DEG C, it is blown into the noble gas of 4.5 cubes of ms/h of ton steel amounts, by high chromium slag
Chromium be reduced to crome metal, it is thus achieved that chrome-bearing steel liquid；
Alternatively, carry out after step (3):
(4) according to the target component of molten steel, in chrome-bearing steel liquid, alloying element is added, it is achieved alloying.
Embodiment 3
A kind of method of melting and reducing height chromium slag in induction furnace, described method comprises the steps:
(1) high chromium slag is mixed according to mass ratio 9:1 with carbon dust；In described high chromium slag, with Cr2O3Meter,
The content of chromium is 40～60w%
(2) molten iron of high chromium slag amount 8.5 times is added；
(3) at 1640 DEG C, it is blown into the noble gas of 5 cubes of ms/h of ton steel amounts, by high chromium slag
Chromium is reduced to crome metal, it is thus achieved that chrome-bearing steel liquid；
Alternatively, carry out after step (3):
(4) according to the target component of molten steel, in chrome-bearing steel liquid, alloying element is added, it is achieved alloying.
Embodiment 4
A kind of method of melting and reducing height chromium slag in induction furnace, described method comprises the steps:
(1) high chromium slag is mixed according to mass ratio 9:1 with carbon dust；In described high chromium slag, with Cr2O3Meter,
The content of chromium is 40～60w%
(2) molten iron of high chromium slag amount 5 times is added；
(3) at 1640 DEG C, it is blown into the noble gas of 2.5 cubes of ms/h of ton steel amounts, by high chromium slag
Chromium be reduced to crome metal, it is thus achieved that chrome-bearing steel liquid；
Alternatively, carry out after step (3):
(4) according to the target component of molten steel, in chrome-bearing steel liquid, alloying element is added, it is achieved alloying.
Applicant states, the present invention illustrates detailed process equipment and the technique of the present invention by above-described embodiment
Flow process, but the invention is not limited in above-mentioned detailed process equipment and technological process, i.e. do not mean that the present invention
Have to rely on above-mentioned detailed process equipment and technological process could be implemented.Person of ordinary skill in the field should
This understands, any improvement in the present invention, and the equivalence of raw material each to product of the present invention is replaced and auxiliary element
Interpolation, concrete way choice etc., within the scope of all falling within protection scope of the present invention and disclosure.
Claims (10)
1. the method that in melting and reducing height chromium slag, chromium carries out alloying in induction furnace, it is characterised in that
Described method is to be mixed with melting and reducing agent by high chromium slag, adds in induction furnace molten iron, is then blown into indifferent gas
Body, is reduced to crome metal by the chromium in high chromium slag, it is thus achieved that chrome-bearing steel liquid；
The intake of described noble gas is 2.5～5 cubes of ms/h of ton steel；
Described high chromium slag is 1:(5～9 with the mass ratio of the molten iron of addition)；
The mass ratio that described high chromium slag mixes with melting and reducing agent is 9:(0～1)；
In described high chromium slag, with Cr2O3Meter, the content of chromium is 40～60w%；
The described melting and reducing agent any a kind or the combination of at least 2 kinds in carbon dust, ferrosilicon powder or aluminium powder.
2. the method for claim 1, it is characterised in that described melting and reducing agent is carbon dust.
3. the method for claim 1, it is characterised in that described high chromium slag mixes with melting and reducing agent
Mass ratio be 9:1.
4. the method for claim 1, it is characterised in that described noble gas is selected from helium and/or argon
Gas.
5. method as claimed in claim 4, it is characterised in that described noble gas is argon.
6. the method for claim 1, it is characterised in that the temperature of described reduction is more than 1600 DEG C.
7. method as claimed in claim 6, it is characterised in that the temperature of described reduction is 1600～1700 DEG C.
8. the method for claim 1, it is characterised in that add alloying metal unit in chrome-bearing steel liquid
Element, it is achieved alloying.
9. the method for claim 1, it is characterised in that described alloy includes ferrochrome, ferromanganese, aluminum
Any a kind or the combination of at least 2 kinds in ferrum, molybdenum-iron.
10. the method as described in one of claim 1～7, it is characterised in that described method includes walking as follows
Rapid:
(1) high chromium slag is mixed according to mass ratio 9:1 with carbon dust；
(2) high chromium slag amount 5～the molten iron of 9 times are added；
(3) it is blown into noble gas, the chromium in high chromium slag is reduced to crome metal, it is thus achieved that ferrochrome liquid；
Alternatively, carry out after step (3):
(4) in chrome-bearing steel liquid, alloying metal element is added, it is achieved alloying.
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| JPS54158313A (en) * | 1978-06-03 | 1979-12-14 | Nippon Steel Corp | Chromium removing method for chromium-containing slag |
| JP2002235124A (en) * | 2001-02-08 | 2002-08-23 | Nippon Steel Corp | Method for recovering chromium from chromium- containing slag |
| JP4427370B2 (en) * | 2004-03-26 | 2010-03-03 | Ｊｆｅスチール株式会社 | Method for reforming slag of chromium ore smelting reduction furnace |
| CN101906500A (en) * | 2010-02-05 | 2010-12-08 | 甘肃锦世化工有限责任公司 | Method for directly producing chrome-base alloy steel by comprehensively using calcium-free chrome slag |
| CN102864311A (en) * | 2012-09-21 | 2013-01-09 | 承德建龙特殊钢有限公司 | Recovery method of chromium in high chromium-content slag in steel making-LF (ladle furnace) working procedure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10323507A1 (en) * | 2003-05-24 | 2004-12-09 | Sms Demag Ag | Process for the recovery of metallic elements, in particular metallic chromium, from slags containing metal oxide in an electric arc furnace |
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2014
- 2014-07-18 CN CN201410344361.8A patent/CN104087709B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54158313A (en) * | 1978-06-03 | 1979-12-14 | Nippon Steel Corp | Chromium removing method for chromium-containing slag |
| JP2002235124A (en) * | 2001-02-08 | 2002-08-23 | Nippon Steel Corp | Method for recovering chromium from chromium- containing slag |
| JP4427370B2 (en) * | 2004-03-26 | 2010-03-03 | Ｊｆｅスチール株式会社 | Method for reforming slag of chromium ore smelting reduction furnace |
| CN101906500A (en) * | 2010-02-05 | 2010-12-08 | 甘肃锦世化工有限责任公司 | Method for directly producing chrome-base alloy steel by comprehensively using calcium-free chrome slag |
| CN102864311A (en) * | 2012-09-21 | 2013-01-09 | 承德建龙特殊钢有限公司 | Recovery method of chromium in high chromium-content slag in steel making-LF (ladle furnace) working procedure |
Non-Patent Citations (1)
| Title |
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| 含铬滤渣冶炼铬铁的试验研究;王永钢;《第19届全国铁合金学术研讨会论文集》;20101231;第51-52页3.0节及表1 * |
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